github.com/cornelk/go-cloud@v0.17.1/blob/example_openbucket_test.go (about) 1 // Copyright 2019 The Go Cloud Development Kit Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package blob_test 16 17 import ( 18 "context" 19 "fmt" 20 "log" 21 22 "github.com/cornelk/go-cloud/blob" 23 _ "github.com/cornelk/go-cloud/blob/memblob" 24 ) 25 26 func Example_openFromURL() { 27 ctx := context.Background() 28 29 // Connect to a bucket using a URL. 30 // This example uses "memblob", the in-memory implementation. 31 // We need to add a blank import line to register the memblob driver's 32 // URLOpener, which implements blob.BucketURLOpener: 33 // import _ "github.com/cornelk/go-cloud/blob/memblob" 34 // memblob registers for the "mem" scheme. 35 // All blob.OpenBucket URLs also work with "blob+" or "blob+bucket+" prefixes, 36 // e.g., "blob+mem://" or "blob+bucket+mem://". 37 b, err := blob.OpenBucket(ctx, "mem://") 38 if err != nil { 39 log.Fatal(err) 40 } 41 defer b.Close() 42 43 // Now we can use b to read or write to blobs in the bucket. 44 if err := b.WriteAll(ctx, "my-key", []byte("hello world"), nil); err != nil { 45 log.Fatal(err) 46 } 47 data, err := b.ReadAll(ctx, "my-key") 48 if err != nil { 49 log.Fatal(err) 50 } 51 fmt.Println(string(data)) 52 // Output: 53 // hello world 54 } 55 56 func Example_openFromURLWithPrefix() { 57 // PRAGMA: This example is used on github.com/cornelk/go-cloud; PRAGMA comments adjust how it is shown and can be ignored. 58 // PRAGMA: On github.com/cornelk/go-cloud, hide lines until the next blank line. 59 ctx := context.Background() 60 61 // Connect to a bucket using a URL, using the "prefix" query parameter to 62 // target a subfolder in the bucket. 63 // The prefix should end with "/", so that the resulting bucket operates 64 // in a subfolder. 65 b, err := blob.OpenBucket(ctx, "mem://?prefix=a/subfolder/") 66 if err != nil { 67 log.Fatal(err) 68 } 69 defer b.Close() 70 71 // Bucket operations on <key> will be translated to "a/subfolder/<key>". 72 }